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IEEE International Symposium on Circuits and systems (ISCAS)

作者： R. Sheen S. Wang O.T.-C. Chen Ruey-Liang Ma Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chiayi Taiwan Computer System Development Department Computer & Communication Research Laboratory Industrial Technology and Research Institute Hsinchu Taiwan

Typically, two's complement is chosen to represent numbers since arithmetic operations of addition and subtraction are easy to perform. However, due to sign extension, an arithmetic operation for small dynamic data ranges may require switching power in the entire word length. Herein, we develop a two's complement adder with the dynamic-range determination and sign-extension units to reduce power consumption. According to the actual data range by minimizing sign-extension bits, only partial functional blocks of an adder are active to generate a final result of which sign bit is then extended to match the original word length. Experimental results demonstrate that our 32-bit carry-lookahead adder has 22.9% power reduction than the conventional one while dynamic ranges of input data are the Gaussian distribution with a mean of 16 bits and a standard deviation of 8 bits.

关键词： Energy consumption Dynamic range Adders Communication switching Arithmetic Capacitance Power dissipation Voltage Frequency Laboratories

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Relative convergence of the cascade RLS with subsection adaptation algorithm

Relative convergence of the cascade RLS with subsection adap...

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Asilomar Conference on Signals, systems & computers

作者： G. Zakaria A.A. Beex The Bradley Department of Electrical and Computer Engineering VIRGINIA TECH Systems Group-DSP Research Laboratory Blacksburg VA USA Hughes Network Systems Germantown MD USA

We analyze the convergence behavior of the CRLS-SA algorithm for inverse filtering. The CRLS-SA is a cascade adaptive filter based on the RLS algorithm, with each section adapted independently based on global minimization. The subsection adaptation results in reduced computational complexity. The rate of convergence is evaluated based on the convergence time constant defined as the ratio of condition number and sensitivity. The smaller the convergence time constant, the faster the structure converges. Analysis and simulation explain and show that CRLS-SA exhibits faster convergence than the direct form RLS adaptive filter for speech type signals.

关键词： Convergence Resonance light scattering Adaptive filters Speech analysis Algorithm design and analysis Filtering algorithms Minimization methods Computational complexity Signal analysis Computational modeling

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RAPTOR: a single chip multiprocessor

RAPTOR: a single chip multiprocessor

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IEEE Asia-Pacific Conference on ASIC (AP-ASIC)

作者： Sang-Won Lee Yun-Seob Song Soo-Won Kim Hyeong-Cheol Oh Woo-Jang Hahn Department of Electronics Engineering ASIC Laboratory Korea University Seoul South Korea Department of Information Engineering Parallel Computation Lab Korea University Seoul South Korea Computer System Research Department Electronics and Telecommunications Research Institute Seoul South Korea

A microarchitecture of a processor named RAPTOR is described. RAPTOR is a single chip multiprocessor developed for exploiting thread-level parallelism. RAPTOR includes four identical processors, a graphics coprocessor, and an external cache controller. Each processor has a 16 KB primary cache and implements SPARC version 9 instruction set architecture. The external cache controller provides direct connection to a large external second level cache. RAPTOR is designed as a building block of multiprocessor systems such as symmetric multiprocessor machines.

关键词： Coprocessors Yarn Parallel processing Graphics Concurrent computing Microarchitecture Multiprocessing systems Circuits Hardware Operating systems

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Preface

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 1999年 1627卷 v-vii页

作者： Asano, Takao Imai, Hiroshi Lee, D.T. Nakano, Shin-Ichi Tokuyama, Takeshi Department of Information and System Engineering Chuo University 1-13-27 Kasuga Bunkyo-ku Tokyo Japan Department of Information Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo Japan Institute of Information Science Academia Sinica Nankang Taipei Taiwan Department of Computer Science Gunma University 1-5-1 Tenjin-cho KiryuGunma Japan IBM Tokyo Research Laboratory 1623-14 Shimo-Tsuruma YamatoKanagawa Japan

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Cascade recursive least squares with subsection adaptation for AR parameter estimation

Cascade recursive least squares with subsection adaptation f...

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1998 23rd IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 1998

作者： Zakaria, Gaguk Beex, A.A. Hughes Network Systems Germantown MD 20876 United States Systems Group - DSP Research Laboratory Bradley Department of Electrical and Computer Engineering VIRGINIA TECH Blacksbwrg VA 24061 United States

ISBN: (纸本)0780344286

We propose the adaptive cascade recursive least squares (CRLS-SA) algorithm for the estimation of linear prediction, or AR model, coefficients. The CRLS-SA algorithm features low computational complexity since each section is adapted independently from the other sections. It is shown that the CRLS-SA algorithm can yield AR coefficient estimates closer to the true values, for some known signals, than the widely used autocorrelation method. The CRLS-SA converges faster to the true values of the model, which is critically important for estimation from short data records. While the computational effort of CRLS-SA is a factor of 3 to 4 higher than that for the autocorrelation method, the improvement in performance yields a viable alternative for a number of applications. © 1998 IEEE.

关键词： Autocorrelation

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The prototype of continuous media file system, CrownFS

The prototype of continuous media file system, CrownFS

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International Conference on Information networking

作者： Se-Jin Hwang Jin-Uok Kim Myong-Soon Park Oh-Young Kwon Tae-Geun Kim Computer Systems Laboratory Computer Science Department Korea University Seoul South Korea Distributed Computing Laboratory Network Computing Department Systems Engineering Research Institute Daejeon South Korea

ISBN: (纸本)0818672250

Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies.

关键词： Prototypes File systems Streaming media network servers Personal communication networks Multimedia systems Workstations High-speed networks File servers Costs

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Cascade recursive least squares with subsection adaptation for AR parameter estimation

Cascade recursive least squares with subsection adaptation f...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： G. Zakaria A.A. Beex Systems Group DSP Research Laboratory The Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA Hughes Network Systems Germantown MD USA Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA

关键词： Least squares approximation Parameter estimation Autocorrelation Filters Bit rate Speech coding Recursive estimation Predictive models Resonance light scattering Digital signal processing

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Object-oriented model refinement technique in software reengineering

Object-oriented model refinement technique in software reeng...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Wei-Jin Park Sang-Yoon Min Doo-Hwan Bae Pyeong-Soo Mah Department of Computer Science Korea Advanced Institute of Science and Technology Taejon South Korea System Engineering Research Institute Object-oriented Laboratory Taejon South Korea

ISBN: (纸本)0818685859

Software reengineering for object-oriented rearchitecturing offers an exciting opportunity in migrating old legacy systems to evolvable systems in a disciplined manner. In the twofold-strategy software reengineering for object-oriented rearchitecturing, one of the problems to be solved is to derive a proper object-oriented model from the output of reverse engineering and the output of forward engineering. In general, the outputs of forward and reverse engineering can be inconsistent in their abstract levels, the amount of design information, naming conventions, and structures. In this paper we present an Object-oriented model Refinement Technique (ORT) to build a final object model in the twofold-strategy software reengineering. We first organize the information gained from reverse engineering into specification information tree, and then compare the entities in the specification information tree with the information from forward engineering using tree-structured data dictionary to produce the final model. We demonstrate the usability of ORT by an example.

关键词： Object oriented modeling Reverse engineering Read only memory Electrical capacitance tomography systems engineering and theory Costs Software maintenance computer science Data engineering Dictionaries

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Towards automatic multilevel indexing for Thai text information retrieval

Towards automatic multilevel indexing for Thai text informat...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： A. Kawtrakul C. Thumkanon P. McFetridge Natural Language Processing and Intelligent lnformation System Technology Research Laboratory Department of Computer Engineering Kasetsart University Bangkok Thailand Department of Linguistics Simon Fraser University Burnaby Canada

To enhance the effectiveness of Thai text retrieval system, we need a significant improvement in automatic indexing. This paper is intended to provide the application of statistical and natural language processing techniques to obtain multilevel content identifiers: phrasal level, single term level and conceptual level. These multilevel indices will cover a very wide range of document retrieval without degradation of system performance. Automatic multilevel indexing for Thai text requires three processes: lexical token identification, phrase identification and extraction, and multilevel index generation. The results give a significant benefit both in precision and recall.

关键词： Information retrieval Degradation Natural language processing Machine assisted indexing system performance Natural languages Thesauri Intelligent systems Laboratories Telephony

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Backward transliteration for Thai document retrieval

Backward transliteration for Thai document retrieval

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IEEE Asia-Pacific Conference on Circuits and systems

作者： A. Kawtrakul A. Deemagarn C. Thumkanon N. Khantonthong P. McFetridge Natural Language Processing and Intelligent Information System Technology Research Laboratory Department of Computer Engineering Kasetsart University Bangkok Thailand Department of Linguistics Simon Fraser University Burnaby Canada

Thai text retrieval systems always involve documents that use loan words (borrowed from foreign language), especially in the area of science and engineering. This paper describes an algorithmic approach to backward machine transliteration aimed at improving the retrieval process. The approach consists of two main steps: identifying loan words and back transliterating. The model of backward transliteration works successfully at approximately 95% including phonetic equivalent.

关键词： Natural language processing Intelligent systems Information systems Laboratories Telephony Information retrieval Writing Microcomputers Machine assisted indexing

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